When working on mail flow issues, one of the first troubleshooting steps with any mail server is to try and telnet into port 25 of the server. Exchange has an error, 530, that says that the smtp connection wasn’t authenticated. If you’re trying to relay through an Exchange server, that’s a good thing, as you wouldn’t want an open relay. However, if you’re trying to relay to an Exchange server, that’s not such a good thing. So let’s look at what this symptom looks like. First we try and telnet into port 25 of the server: telnet exchange.krypted.com 25 Which shows the following: 220 exchange.krypted.com Then we say hi: Helo…
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Change MTU in Windows Server
When we transfer certain amounts of data in a packet we might cause that packet to fragment. The less fragmentations without requiring a collision or a re-send of a packet, the more efficient network traffic can be. The MTU defines the packet size. Different types of data or network links respond differently. To change the MTU on a Windows Server we’re going to use the netsh command. First, we’re going to use ping to ping a host on our network, using -f and then -l which allows us to define the MTU size. In this case we’re going to use 1500: ping https://krypted.com/ -f -l 1500 We should get an…
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Setting Up Active Directory In Windows Server 2012
Installing Active Directory services is arguably one of the first things done on many a Windows Server. And for well over a decade you could unbox, update, run dcpromo and be done with much of that. While the wizards are still there, in the case of Windows Server 2012, the process has changed ever-so-slightly. To install a domain controller in Windows Server 2012, start with Server Manager. This new tool is the place where you start many a process in a Windows Server now, and Active Directory is no different. To get started, first open Server Manager. From Server Manager, click on the Manage menu and select Add Roles and…
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The Return of Dallas: 25 Business Tips Learned From The Ewings
JR Ewing (aka Larry Hagman) passed away this week. He was one of the stars of Dallas and the famed character from the “who shot JR” line. He also had a ton of great quotes over the years, such as “Say, why don’t you have that junior plastic surgeon you married design you a new face: one without a mouth!” and “”Revenge is the single most satisfying feeling in the world!” He also busted out with “A conscience is like a boat or a car. If you feel you need one, rent it.” and one that every NFL running back seems to bust out with in the last year of their contract “Contracts…
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JAMF Nation User Conference 2012
I mentioned the JAMF Nation User Conference on the site before, but now I need to mention it again. Mostly because I’ll now be doing a presentation now. I know, I said I wasn’t going to be doing much public speaking. But the only conference I’ve been to in the last decade that I wasn’t speaking at has been the JAMF Nation User Conference. Sooo, how could I not, when the conference is, after all, in the city I live in! Anyway, my session has been added to the sessions page: http://www.jamfsoftware.com/events/user-conferences/jamf-nation-user-conference-2012/sessions Hope to see you there!
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2012 Penn State MacAdmins Slides